"Well my good man, I see there being a number of reasons you could want a scroll.
One is because you need something identified, a service I could easily provide for less than the cost of a scroll.
Two is because you need the spell. Selling you a scroll means that I would have to go the time, expense, and trouble of finding more pearls and making a new scroll. I could just as easily rent you my spellbook and a room for a day and remove the middle steps.
Three is because you think you you will be stumbling upon some magical items soon. As a purveyor of magical goods I have a bit of a vested interest in future clients, and we might be able to make a deal depending on just what items you think you may find." The man simply raises his eyebrows at Kote when he is finished.